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So vs Therefore: What's the Difference?

B1 Grammar & Usage

What's the Difference?

So' is used as a more casual conjunction for results, while 'therefore' means 'for this reason' in a more formal context.

Memory Tip: so = casual, therefore = formal

so has a long /oʊ/, therefore has a stress on /ðer/

so /soʊ/

conjunction
Used to show the result of something.
Example:
I was feeling tired, so I went to bed early last night.
Common patterns:
I like X so I do Y It is hot
so →

therefore

adverb
"Therefore" is used to show that something is a result or conclusion of what has just been said.
Example:
She studied hard for the exam; therefore, she passed with flying colors.
Common patterns:
therefore therefore therefore
therefore →

Common Mistakes

I forgot my umbrella, so I got wet.
I forgot my umbrella, therefore I got wet.
The sentence explains a reason and result in a formal way, so 'therefore' is more appropriate.
She didn't study for the test, therefore she didn't pass.
She didn't study for the test, so she didn't pass.
The sentence presents a casual cause and effect, making 'so' the better choice.

Quick Practice

0/2 correct
1. I was feeling tired, ____ I went to bed early last night.
2. She studied hard for the exam; ____, she passed with flying colors.

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